93090821 has 8 divisors (see below), whose sum is σ = 97277760. Its totient is φ = 88915552.

The previous prime is 93090817. The next prime is 93090839. The reversal of 93090821 is 12809039.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 93090821 - 2² = 93090817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93090871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16106 + ... + 21108.

It is an arithmetic number, because the mean of its divisors is an integer number (12159720).

Almost surely, 2^93090821 is an apocalyptic number.

It is an amenable number.

93090821 is a deficient number, since it is larger than the sum of its proper divisors (4186939).

93090821 is a wasteful number, since it uses less digits than its factorization.

93090821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5835.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 93090821 is about 9648.3584614172. The cubic root of 93090821 is about 453.2129249973.

The spelling of 93090821 in words is "ninety-three million, ninety thousand, eight hundred twenty-one".